학술논문

Dynamic evolution of vortex dipoles
Document Type
article
Source
Revista Brasileira de Ensino de Física. September 2011 33(3)
Subject
vortex dipoles
visualization techniques
eynolds number
Péclet number
stratified bed
Language
English
ISSN
1806-1117
Abstract
Vortex dipoles are fundamental in fluid mechanics. They are found in geophysics, engineering and industry. The two necessary conditions to generate them are a plane flow and a generating force. In this work, an experimental design to generate vortex dipoles in stratified beds is presented. Vortex rings were generated under diferent volumetric flow conditions. Through visualization techniques, three stages were observed during the evolution of the rings: an exponential stage associated with the injection of the tracer, a parabolic stage and finally a dissipative stage. From the experimental results, the Reynolds and Péclet numbers were computed indicating laminar flows and difusive flows, respectively.